What are the methods to improve the cooling effect of a three-layer co extrusion blown film machine?

As an advanced plastic film production equipment, the three-layer co extrusion blown film machine can produce high-performance composite films through the design of multi-layer composite structures, meeting the special needs of different industries. Its efficient production capacity, excellent film performance, and energy-saving and environmentally friendly characteristics have made it widely used in packaging, agriculture, construction, medical and other fields. With the continuous advancement of technology, three-layer co extrusion blown film machines will continue to develop towards intelligence, efficiency, and environmental protection, bringing more innovation and breakthroughs to the plastic film industry.

The blown film system includes an air ring, a cooling device, and a traction device. The wind ring blows molten plastic tubes into thin films through high-speed airflow, while the cooling device rapidly cools and shapes the films through cold air or water cooling. The traction device is responsible for evenly pulling out and coiling the film. The control system is the "brain" of the equipment, responsible for monitoring and adjusting the entire production process. Modern three-layer co extrusion blown film machines usually use PLC (programmable logic controller) and touch screen operation interface, which can achieve automated control and precise parameter adjustment.

What are the methods to improve the cooling effect of a three-layer co extrusion blown film machine?

Optimize the design of the cooling air ring

Improved wind ring structure: Adopting a new type of wind ring structure, such as multi-layer concentric wind rings or wind rings with special guide vanes, enables cooling air to be more evenly distributed on the surface of the film, improving cooling efficiency.

Add the function of adjusting the air volume of the air ring: Install multiple independently adjustable air vents or valves to accurately adjust the air volume according to the cooling needs of different parts of the film, achieving more precise cooling control.

Improve the quality and flow rate of cooling air

Using low-temperature cooling air: By installing an air cooler or refrigeration unit, the air entering the air ring is pre cooled to a lower temperature, increasing the temperature difference between the cooling air and the film and improving the cooling effect.

Increase fan power: Replace the fan with a higher power to increase the flow of cooling air. At the same time, optimize the installation position and pipeline layout of the fan, reduce wind resistance, and ensure that the cooling air can smoothly reach the surface of the film.

Improve the layout of the cooling system

Reasonably set the angle and direction of the cooling air: adjust the installation angle of the cooling air ring to blow the cooling air towards the film at an appropriate angle, which can effectively remove heat and avoid excessive blowing force on the film, affecting its stability. For example, using oblique or circular blowing methods to better adhere the cooling air to the surface of the film.

Add auxiliary cooling devices: Install auxiliary cooling fans or spray devices in the cooling area of the blown film machine. The auxiliary fan can provide additional cooling air on the side or below the film, enhancing the cooling effect; The spray device sprays water mist onto the surface of the film, using the evaporation and heat absorption of water to reduce the temperature of the film. However, attention should be paid to controlling the amount of water sprayed and humidity to avoid water droplets or adhesion on the surface of the film.

Strengthen the maintenance of the cooling system

Regularly clean the cooling air ring and pipeline: Dust, impurities, and plastic debris may accumulate inside the cooling air ring and pipeline, affecting the circulation and uniformity of the cooling air. Regularly cleaning these components and keeping the cooling system clean can help improve cooling efficiency.

Check and maintain refrigeration equipment (if any): If refrigeration units or air coolers are used to cool the air, their operating status should be regularly checked, worn parts should be replaced in a timely manner, refrigerant should be added to ensure the normal operation of the refrigeration equipment, and the low-temperature effect of the cooling air should be guaranteed.

The three-layer co extrusion blown film machine is an efficient equipment widely used in plastic film production. Its core feature is to use three-layer co extrusion technology to simultaneously extrude and composite different types of plastic raw materials together, forming multi-layer films with excellent performance. This type of equipment has a wide range of applications in packaging, agriculture, healthcare, construction, and other fields, capable of producing thin film products with different properties such as high strength, high transparency, high barrier properties, and heat resistance.

Three different plastic materials are heated and melted separately through three independent extruders. Each extruder sets the appropriate temperature based on the characteristics of the material to ensure that the plastic can melt evenly and have good flowability. Molten plastic materials enter the mold head through their respective channels, and the mold head arranges the three materials in layers according to design requirements, forming a multi-layered tubular film. The design of the mold head ensures good bonding between the materials of each layer, while avoiding mixing between layers.